期刊
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
卷 270, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2022.120858
关键词
Ratio fluorescence; Second-order scattering (SOS); MIL-68(In)-NH2; Actual water samples; Hg2+ detection; New strategy
类别
资金
- National Natural Science Foundation of China [21665024]
- Natural Science Foundation of Gansu Province [20JR10RA083]
- Northwest Normal University Young Teachers Research Capacity Promotion Plan [NWNULKQN-18-23]
- Key Lab of Eco-Environments Related Polymer Materials of MOE
- Key Lab of Polymer Materials of Gansu Province
This research presents a new ratiometric detection method by using MIL-68(In)-NH2 as both the fluorescence element and the scattered light unit. The method combines fluorescence and scattering to construct a fluorescence and scattered light ratio system. The method shows good performance in detecting Hg2+ and has been successfully applied to the evaluation of Hg2+ in actual water samples.
Ratio fluorescence has attracted much attention because of its self-calibration properties. However, it is difficult to obtain suitable fluorescent materials with well-resolved signals simultaneously under one excitation. In this work, we report a different strategy, using MIL-68(In)-NH2 as both the fluorescence element and the scattered light unit, and coupling the fluorescence and the scattered light to construct the fluorescence and scattered light ratio system. Based on the optical properties and the second-order scattering (SOS) of the material nanoparticles, the synthesized MIL-68(In)-NH2 can be used to realize the ratio detection of Hg2+. Because the scattering intensity of small particle MIL-68(In)-NH2 is weak, SOS is not obvious. When Hg2+ is introduced the coordination reaction between the amino nitrogen atoms of MIL-68(In)-NH2 and Hg2+ make the particles larger, resulting in the decrease of fluorescence and the enhancement of SOS. As a result, a novel He ratiometric detection method is developed by using the dual signal responses of the fluorescence and scattering. Under the optimal conditions (pH = 6, reaction time 5 min, room temperature, and the maximum excitation wavelength 365 nm), the linear range of the method is 0-100 mu M, and the detection limit is 5.8 nM (Ksv = 9.89 x 10(9) M-1). In addition, the probe is successfully used to evaluate Hg2+ in actual water samples. Compared with the traditional method of recording only the fluorescence signal, the proposed fluorescence-scattering method provides a new strategy for the design of ratiometric sensors. (C) 2022 Elsevier B.V. All rights reserved.
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